Holocene environmental conditions in the coastal ocean off East Antarctica - evidence from the paleo-diet of snow petrels

南极洲东部沿海海洋的全新世环境条件——来自雪海燕古饮食的证据

• 批准号: 522373452
• 负责人: Dr. Sonja Berg
• 金额: --
• 依托单位: Institut für Geologie und Mineralogie
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/522373452?language=en
• 关键词: Holocene; environmental; conditions; coastal; ocean

Reconstructions of past environmental conditions in the coastal ocean off East Antarctica are crucial to better understand processes of ocean - ice interaction. For the proposed project, stomach oil deposits of snow petrels (Pagodroma nivea) (Antarctic mumiyo) shall be used as a paleoenvironmental archive of Holocene sea-ice conditions in the coastal zone of the Southern Ocean. A multiproxy approach, combining inorganic, lipid (fatty acids) and isotope (δ13C and δ15N) analyses will be applied to infer past changes in snow petrel diet, which can be linked to environmental conditions in the foraging range of the birds, such as sea ice variability, polynya activity and primary production. The study area comprises a large sector of the East Antarctic coastline, ranging from Wilkes Land (Windmill Islands) to Mac Robertson Land (Framnes Mountains) and is not well-covered by sea-ice records from the coastal zone. At the same time, some outlet glacier systems along this part of the coastline are sensitive to ocean warming, highlighting the need for a better understanding of ocean - ice interaction under changing climatic conditions in these regions. The research questions that will be addressed with this project are, if changes in Holocene sea ice coverage in the coastal zone i) occurred consistently across the East Antarctic margin, ii) were associated with shifts in the position of oceanic fronts, such as the southern boundary of the Antarctic Circumpolar Current and iii) are correlated with the advance/retreat of the ice sheet margin and/or its outlet glacier systems. To extent the existing sample set, sampling of mumiyo deposits in un-glaciated coastal sites (Windmill Islands, Bunger Hills, Gaussberg and Vestfold Hills) is part of the proposed project. Field work will be conducted within the scope of the RV Polarstern expeditions PS140 (EASI 2) and PS141 (EASI 3) that are scheduled back-to-back for the austral summer season 2023/24.

对沿海离子的过去环境条件的重建。绳索，例如海冰可变性，Polynya活动和主要的Prody A包括南极海岸线的大型部门，从Wilkes Land（风车群岛）到Mac Robertson Land（Framness Mountains）不等，并且来自海岸的人不好。区域。海岸线对海洋的升温很敏感，在这些军团的气候状况变化下，需要更好地介绍Cean-Ice的互动。随着位置的偏移，海洋阵线（例如南极循环电流的南部边界）和iii）冰盖边缘和/或其出口冰川系统。在RV Polarstern Expeditions PS140（EAI 2）和PS141（EAI 3）的范围内，该探险计划定于2023/24澳大利亚夏季季节背靠背。